Monolithic Thermocouple Amplifiers with Cold Junction Compensation AD5

The Datasheet Archive - 100 Million Datasheets from 7500 Manufacturers.

Monolithic Thermocouple Amplifiers with Cold Junction Compensation AD5

Datasheet Thumbnail

Top Searches for this datasheet

FEATURES Pretrimmed Type (AD594} Type (AD595) Thermocouples Used with Type Thermocouple Inputs Impedance Voltage Output: Built-In Point Compensation Wide Power Supply Range: Power: typical Thermocouple Failure Alarm Laser Wafer Trimmed Calibration Accuracy Setpoint Mode Operation Self-Contained Celsius Thermometer Operation High Impedance Differential Input Side-Brazed Cost Cerdip
Monolithic Thermocouple Amplifiers with Cold Junction Compensation AD594*/AD595*
-ALM +ALM COMP OVERLOAD DETECT
AD594/AD595
POINT COMP.
PRODUCT DESCRIPTION
AD594/AD595 complete instrumentation amplifier thermocouple cold junction compensator monolithic chip. combines point reference with precalibrated amplifier produce high level mV/°C) output directly from thermocouple signal. Pin-strapping options allow used linear amplifier-compensator switched output setpoint controller using either fixed remote setpoint control. used amplify compensation voltage directly, thereby converting stand-alone Celsius transducer with impedance voltage output. AD594/AD595 includes Thermocouple Failure Alarm that indicates both thermocouple leads become open. alarm output flexible format which includes drive capability. AD594/AD595 powered from single ended supply (including including negative supply, temperatures below measured. minimize self-heating, unloaded AD594/AD595 will typically operate with total supply current also capable delivering excess load. AD594 precalibrated laser wafer trimming match characteristic type (iron-constantan) thermocouples AD595 laser trimmed type (chromel-alumel) inputs. temperature transducer voltages gain control resistors available package pins that circuit recalibrated thermocouple types addition three resistors. These terminals also allow more precise calibration both thermocouple thermometer applications.
*Protected U.S. Patent 4,029,974.
AD594/AD595 available performance grades. versions have calibration accuracies 3°C, respectively. Both designed used from +50°C, available 14-pin, hermetically scaled, sidebrazed ceramic DIPs well cost cerdip packages.
PRODUCT HIGHLIGHTS
AD594/AD595 provides cold junction compensation, amplification, output buffer single package. Compensation, zero, scale factor precalibrated laser wafer trimming (LWT) each chip. Flexible pinout provides operation setpoint controller stand-alone temperature transducer calibrated degrees Celsius. Operation remote application sites facilitated quiescent current wide supply voltage range dual supplies spanning Differential input rejects common-mode noise voltage thermocouple leads.
REV.
Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties which result from use. license granted implication otherwise under patent patent rights Analog Devices.
Technology Way, P.O. 9106, Norwood, 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703
AD594/AD595-SPECIFICATIONS unless otherwise noted)
Model ABSOLUTE MAXIMUM RATING Common-Mode Input Voltage Differential Input Voltage Alarm Voltages +ALM -ALM Operating Temperature Range Output Short Circuit Common TEMPERATURE MEASUREMENT (Specified Temperature Range +50°C) Calibration Error +25°C1 Stability Temperature Gain Error Nominal Transfer Function AMPLIFIER CHARACTERISTICS Closed Loop Gain Input Offset Voltage Input Bias Current Differential Input Range Common-Mode Range Common-Mode Sensitivity Power Supply Sensitivity Output Voltage Range Dual Supply Single Supply Usable Output Current4 Bandwidth ALARM CHARACTERISTICS VCE(SAT) Leakage Current Operating Voltage Short Circuit Current POWER REQUIREMENTS Specified Performance Operating5 Quiescent Current Load) PACKAGE OPTION TO-116 (D-14) Cerdip (Q-14) AD594A +125 AD594C +125 0.15 Indefinite 0.15 Indefinite 0.15 Indefinite
Type (AD594), Type (AD595) Thermocouple,
AD595A +125 AD595C +125
Units Volts Volts Volts Volts Volts
0.15 Indefinite
0.05 193.4 (Temperature 51.70 µV/°C 0.15 AD594AD AD594AQ
0.025 0.75 193.4 (Temperature 51.70 µV/°C 0.15 AD595AD AD595AQ
0.05 247.3 (Temperature 40.44 µV/°C 0.15 AD595CD AD595CQ
0.025 0.75 247.3 (Temperature 40.44 µV/°C 0.15
°C/°C mV/°C
Volts mV/V mV/V Volts Volts Volts Volts Volts Volts
AD594CD AD594CQ
NOTES Calibrated minimum error +25°C using thermocouple sensitivity 51.7 µV/°C. Since type thermocouple deviates from this straight line approximation, AD594 will normally read when measuring junction 0°C. AD595 will similarly read 0°C. Defined slope line connecting AD594/AD595 errors measured 50°C ambient temperature. shorted Current Sink Capability single supply configuration limited current drawn ground through resistor output voltages below must exceed -16.5 Specifications shown boldface tested production units final electrical test. Results from those tests used calculate outgoing quality levels. Specifications subject change without notice.
INTERPRETING AD594/AD595 OUTPUT VOLTAGES
achieve temperature proportional output mV/°C accurately compensate reference junction over rated operating range circuit, AD594/AD595 gain trimmed match transfer characteristic type thermocouples 25°C. type output this temperature range 51.70 µV/°C, while type 40.44 µV/°C. resulting gain AD594 193.4 mV/°C divided 51.7 µV/°C) AD595 247.3 mV/°C divided 40.44 µV/°C). addition, absolute accuracy trim induces input offset output amplifier characteristic AD594 AD595. This offset arises because AD594/ AD595 trimmed output while applying 25°C thermocouple input.
Because thermocouple output voltage nonlinear with respect temperature, AD594/AD595 linearly amplifies compensated signal, following transfer functions should used determine actual output voltages: AD594 output (Type Voltage 193.4 AD595 output (Type Voltage 247.3 conversely: Type voltage (AD594 output/193.4) Type voltage (AD595 output/247.3) Table lists ideal AD594/AD595 output voltages function Celsius temperature type ANSI standard thermocouples, with package reference junction 25°C. normally case, these outputs subject calibration, gain temperature sensitivity errors. Output values intermediate temperatures interpolated, calculated using output equations ANSI thermocouple voltage REV.
AD594/AD595
Table Output Voltage Thermocouple Temperature (Ambient +25°C,
Thermocouple Temperature -200 -180 -160 -140 -120 -100 Type Voltage -7.890 -7.402 -6.821 -6.159 -5.426 -4.632 -3.785 -2.892 -1.960 -.995 -.501 .507 1.019 1.277 1.536 2.058 2.585 3.115 4.186 5.268 6.359 7.457 8.560 9.667 10.777 11.887 12.998 14.108 15.217 16.325 17.432 18.537 19.640 20.743 21.846 22.949 24.054 25.161 26.272 AD594 Output -1523 -1428 -1316 -1188 -1046 -893 -729 -556 -376 -189 1022 1233 1445 1659 1873 2087 2302 2517 2732 2946 3160 3374 3588 3801 4015 4228 4441 4655 4869 5084 Type Voltage -5.891 -5.550 -5.141 -4.669 -4.138 -3.553 -2.920 -2.243 -1.527 -.777 -.392 .397 .798 1.000 1.203 1.611 2.022 2.436 3.266 4.095 4.919 5.733 6.539 7.338 8.137 8.938 9.745 10.560 11.381 12.207 13.039 13.874 14.712 15.552 16.395 17.241 18.088 18.938 19.788 AD595 Output -1454 -1370 -1269 -1152 -1021 -876 -719 -552 -375 -189 1015 1219 1420 1620 1817 2015 2213 2413 2614 2817 3022 3327 3434 3641 3849 4057 4266 4476 4686 4896 Thermocouple Temperature 1000 1020 1040 1060 1080 1100 1120 1140 1160 1180 1200 1220 1240 1250 Type Voltage 27.388 28.511 29.642 30.782 31.933 33.096 34.273 35.464 36.671 37.893 39.130 40.382 41.647 42.283 AD594 Output 5300 5517 5736 5956 6179 6404 6632 6862 7095 7332 7571 7813 8058 8181 Type Voltage 20.640 21.493 22.346 23.198 24.050 24.902 25.751 26.599 27.445 28.288 29.128 29.965 30.799 31.214 31.629 32.455 33.277 34.095 34.909 35.718 36.524 37.325 38.122 38.915 39.703 40.488 41.269 42.045 42.817 43.585 44.439 45.108 45.863 46.612 47.356 48.095 48.828 49.555 50.276 50.633 AD595 Output 5107 5318 5529 5740 5950 6161 6371 6581 6790 6998 7206 7413 7619 7722 7825 8029 8232 8434 8636 8836 9035 9233 9430 9626 9821 10015 10209 10400 10591 10781 10970 11158 11345 11530 11714 11897 12078 12258 12436 12524
tables referred zero degrees Celsius. slight variation alloy content between ANSI type FE-CUNI thermocouples Table should used conjunction with European standard thermocouples. Instead transfer function given previously thermocouple table should used. ANSI type NICR-NI thermocouples composed
CONSTANTAN (ALUMEL)
identical alloys exhibit similar behavior. upper temperature limits Table those recommended type type thermocouples majority vendors.
SINGLE DUAL SUPPLY CONNECTIONS
10mV/oC
OVERLOAD DETECT
AD594/AD595 completely self-contained thermocouple conditioner. Using single supply interconnections shown Figure will provide direct output from type thermocouple (AD594) type thermocouple (AD595) measuring from +300°C. convenient supply voltage from used, with self-heating errors being minimized lower supply levels. single supply configuration supply connects with connection strapped power signal common thermocouple wire inputs connect Pins either directly from measuring point through intervening connections similar thermocouple wire type. When alarm output used should connected common precalibrated feedback network tied output provide mV/°C nominal temperature transfer characteristic.
AD594/ AD595
POINT COMP.
IRON (CHROMEL)
COMMON
Figure Basic Connection, Single Supply Operation
REV.
AD594/AD595
using wider ranging dual supply, shown Figure AD594/AD595 interfaced thermocouples measuring both negative extended positive temperatures.
CONSTANTAN (ALUMEL)
printed circuit board layout shown also provides placement optional alarm load resistors, recalibration resistors compensation capacitor limit bandwidth. ensure secure bonding thermocouple wire should cleaned remove oxidation prior soldering. Noncorrosive rosin flux effective with iron, constantan, chromel alumel following solders: tin-5% antimony, tin-5% silver tin-10% lead.
+30V
OVERLOAD DETECT
AD594/ AD595
POINT COMP.
SPAN
FUNCTIONAL DESCRIPTION
IRON (CHROMEL)
AD594 behaves like differential amplifiers. outputs summed used control high gain amplifier, shown Figure
-ALM +ALM COMP
COMMON -15V
Figure Dual Supply Operation
AD594/AD595
OVERLOAD DETECT
With negative supply output indicate negative temperatures drive grounded loads loads returned positive voltages. Increasing positive supply from extends output voltage range well beyond 750°C temperature limit recommended type thermocouples (AD594) 1250°C type thermocouples (AD595). Common-mode voltages thermocouple inputs must remain within common-mode range AD594/AD595, with return path provided bias currents. thermocouple remotely grounded, then dotted line connections Figures recommended. resistor needed this connection assure that common-mode voltages induced thermocouple loop converted normal mode.
THERMOCOUPLE CONNECTIONS
POINT COMP.
Figure AD594/AD595 Block Diagram
isothermal terminating connections pair thermocouple wires forms effective reference junction. This junction must kept same temperature AD594/AD595 internal cold junction compensation effective. method that provides thermal equilibrium printed circuit board connection layout illustrated Figure
IRON (CHROMEL)
-ALM
CONSTANTAN (ALUMEL)
+ALM
normal operation main amplifier output, connected feedback network, Thermocouple signals applied floating input stage, Pins amplified gain differential amplifier then further amplified gain main amplifier. output main amplifier back second differential stage inverting connection. feedback signal amplified this stage also applied main amplifier input through summing circuit. Because inversion, amplifier causes feedback driven reduce this difference signal small value. differential amplifiers made match have identical gains, result, feedback signal that must applied right-hand differential amplifier will precisely match thermocouple input signal when difference signal been reduced zero. feedback network trimmed that effective gain output, Pins results voltage mV/°C thermocouple excitation. addition feedback signal, cold junction compensation voltage applied right-hand differential amplifier. compensation differential voltage proportional Celsius temperature AD594/AD595. This signal disturbs differential input that amplifier output must adjust restore input equal applied thermocouple voltage. compensation applied through gain scaling resistors that effect main output also mV/°C. result, compensation voltage adds effect thermocouple voltage signal directly proportional difference between AD594/AD595 temperature. thermocouple reference junction maintained AD594/AD595 temperature, output AD594/AD595 will correspond reading that would have been obtained from amplification signal from thermocouple referenced bath. REV.
COMP
COMMON
VOUT
Figure Connections
Here AD594/AD595 package temperature circuit board thermally contacted copper printed circuit board tracks under Pins reference junction composed copper-constantan copper-alumel) connection copper-iron copper-chromel) connection, both which same temperature AD594/AD595.
AD594/AD595
AD594/AD595 also includes input open circuit detector that switches alarm transistor. This transistor actually current-limited output buffer, used limit switch transistor either pull-up pull-down operation external alarms. point compensation network voltages available with positive negative temperature coefficients. These voltages used with external resistors modify point compensation recalibrate AD594/AD595 described next column. feedback resistor separately pinned that value padded with series resistor, replaced with external resistor between Pins External availability feedback resistor allows gain adjusted, also permits AD594/ AD595 operate switching mode setpoint operation.
CAUTIONS:
this terminal produced with resistor between balance increase resistor from offset decrease compensation adjusted substantially accommodate different thermocouple type, effect final output voltage will increase decrease proportion. restore nominal output mV/°C gain adjusted match compensation thermocouple input characteristics. When reducing compensation resistance between automatically increases gain within 0.5% correct value. smaller gain required, however, nominal internal feedback resistor paralleled replaced with external resistor. Fine calibration adjustments will require temperature response measurements individual devices assure accuracy. Major reconfigurations other thermocouple types achieved without seriously compromising initial calibration accuracy, long procedure done fixed temperature using factory calibration reference. should noted that intermediate recalibration conditions require negative supply.
EXAMPLE: TYPE RECALIBRATION-AD594/AD595
temperature compensation terminals Pins provided supply small calibration currents only. AD594/AD595 permanently damaged they grounded connected impedance. AD594/AD595 internally frequency compensated feedback ratios (corresponding normal signal gain) more. lower gain desired, additional frequency compensation should added form capacitor from output shown Figure additional 0.01 capacitor between Pins recommended.
AD594/ AD595
300pF COMP 0.01µF
Both AD594 AD595 configured condition output type (chromel-constantan) thermocouple. Temperature characteristics type thermocouples differ less from type than from type therefore AD594 preferred recalibration. While maintaining device constant temperature follow recalibration steps given here. First, measure device temperature tying both inputs common selected common mode potential) connecting AD594 stand alone Celsius thermometer mode. this example assume ambient 24°C initial output Check output verify that corresponds temperature device. Next, measure voltage with high impedance (capacitance should isolated thousand ohms resistance measured terminals). 24°C voltage will about adjust compensation AD594 type thermocouple resistor, should connected between Pins raise voltage ratio thermocouple sensitivities. ratio converting type device type characteristic (AD594) =(60.9 µV/°C)/(51.7 µV/°C)= 1.18 Thus, multiply initial voltage measured experimentally determine value required raise that level. example voltage should about resistance value should approximately zero differential point must shifted back 0°C. This accomplished multiplying original output voltage adjusting measured output voltage this value experimentally adding resistor, between Pins target output value this case should about resistance value should approximately Finally, gain must recalibrated such that output indicates device's temperature once again. this adding third resistor, between Pins
Figure Gain Frequency Compensation
RECALIBRATION PRINCIPLES LIMITATIONS
point compensation network AD594/AD595 produces differential signal which zero corresponds output referenced thermocouple temperature chip. positive output circuit proportional Kelvin temperature appears voltage possible decrease this signal loading with resistor from COM, increase with pull-up resistor from larger positive voltage Note that adjustments should made measuring voltage which tracks avoid destabilizing feedback amplifier measuring instrument should isolated thousand ohms series with lead connected
AD594/ AD595
Figure Decreased Sensitivity Adjustment
Changing positive half differential output compensation scheme shifts zero point away from 0°C. zero restored adjusting current flow into negative input feedback amplifier, pin. current into REV.
AD594/AD595
should back initial reading. resistance value should approximately final connection diagram shown Figure approximate verification effectiveness recalibration measure differential gain output. type should 164.2.
THERMAL ENVIRONMENT EFFECTS
AD594/ AD595
inherent power dissipation AD594/AD595 thermal resistance package make self-heating errors almost negligible. example, still chip ambient thermal resistance about 80°C/watt (for package). nominal dissipation self-heating free less than 0.065°C. Submerged fluorinert liquid (unstirred) thermal resistance about 40°C/watt, resulting selfheating error about 0.032°C. SETPOINT CONTROLLER AD594/AD595 readily connected setpoint controller shown Figure
HEATER DRIVER CONSTANTAN HEATER (ALUMEL)
Figure Type Recalibration
TEMPERATURE COMPARATOR
SETPOINT HIGH SETPOINT SETPOINT VOLTAGE INPUT
When implementing similar recalibration procedure AD595 values will approximately 1.51, respectively. Power consumption will increase about when using AD595 with type inputs. Note that during this procedure crucial maintain AD594/AD595 stable temperature because used temperature reference. Contact with fingers tools ambient temperature will quickly produce errors. Radiational heating from change lighting approach soldering iron must also guarded against.
USING TYPE THERMOCOUPLES WITH AD595
IRON (CHROMEL)
OVERLOAD DETECT
AD594/ AD595
POINT COMP.
(OPTIONAL) HYSTERESIS
TEMPERATURE CONTROLLED REGION
COMMON
Figure Setpoint Controller
Because similarity thermal EMFs +50°C range between type type thermocouples, AD595 directly used with both types inputs. Within this ambient temperature range AD595 should exhibit more than additional 0.2°C output calibration error when used with type inputs. error arises because point compensator trimmed type characteristics 25°C. calculate AD595 output values over recommended -200°C +350°C range type thermocouples, simply ANSI thermocouple voltages referred output equation given page AD595. Because relatively large nonlinearities associated with type thermocouples output will deviate widely from nominal mV/°C. However, cold junction compensation over rated +50°C ambient will remain accurate.
STABILITY OVER TEMPERATURE
thermocouple used sense unknown temperature provide thermal input AD594/AD595. signal cold junction compensated, amplified mV/°C compared external setpoint voltage applied user feedback Table lists correspondence between setpoint voltage temperature, accounting nonlinearity measurement thermocouple. setpoint temperature range within operating range (-55°C +125°C) AD594/AD595, chip used transducer circuit shorting inputs together utilizing nominal calibration mV/°C. This centigrade thermometer configuration shown Figure operation setpoint voltage above voltage corresponding temperature being measured output swings approximately zero volts. Conversely, when temperature rises above setpoint voltage output switches positive limit about volts with supply. Figure shows setpoint comparator configuration complete with heater element driver circuit being controlled AD594/ AD595 toggled output. Hysteresis introduced injecting current into positive input feedback amplifier when output toggled high. With AD594 about into terminal provides hysteresis. When using single supply with AD594, resistor from will supply current when output forced high (about widen hysteresis band decrease resistance connected from
ALARM CIRCUIT
Each AD594/AD595 tested error over temperature with measuring thermocouple 0°C. combined effects cold junction compensation error, amplifier offset drift gain error determine stability AD594/AD595 output over rated ambient temperature range. Figure shows AD594/AD595 drift error envelope. slope this figure units °C/°C.
+0.6oC
DRIFT ERROR
25oC -0.6oC TEMPERATURE AD594C/AD595C
50oC
applications AD594/AD595 -ALM connection, should constrained that more positive than (V+) This most easily achieved connecting either common most REV.
Figure Drift Error Temperature
AD594/AD595
applications that alarm signal, will grounded signal will taken from +ALM typical application shown Figure this configuration alarm transistor will normal operation pull will cause +ALM output high. both thermocouple leads interrupted, +ALM will driven low. shown Figure this signal compatible with input gate which used buffer and/or inverter.
CONSTANTAN (ALUMEL)
CONSTANTAN (ALUMEL)
+10V 10mV/oC
OVERLOAD DETECT
AD594/ AD595
POINT COMP.
IRON (CHROMEL)
ALARM
ALARM GATE 10mV/oC
ALARM RELAY
-12V
OVERLOAD DETECT
AD594/ AD595
POINT COMP.
Figure -ALM Driving Negative Referenced Load
IRON (CHROMEL)
collector (+ALM) should allowed become more positive than (V-) however, permitted more positive than emitter voltage (-ALM) should constrained that does become more positive than volts below applied circuit.
Figure Using Alarm Drive Gate ("Grounded'' Emitter Configuration)
Since alarm high level output used directly drive other indicator shown Figure
CONSTANTAN (ALUMEL)
Additionally, AD594/AD595 configured produce extreme upscale downscale output applications where extra signal line alarm inappropriate. tying either thermocouple inputs common most runaway control conditions automatically avoided. common connection creates downscale output thermocouple opens, while connecting common provides upscale output.
CELSIUS THERMOMETER
10mV/oC
AD594/AD595 configured stand-alone celsius thermometer shown Figure
+15V
OVERLOAD DETECT
AD594/ AD595
OUTPUT 10mV/oC
POINT COMP.
OVERLOAD DETECT
AD594/ AD595
POINT COMP.
IRON (CHROMEL)
COMMON
Figure Alarm Directly Drives
-15V
series resistor will limit current omitted since alarm output transistor current limited about transistor, however, will operate high dissipation mode temperature circuit will rise well above ambient. Note that cold junction compensation will affected whenever alarm circuit activated. time required chip return ambient temperature will depend power dissipation alarm circuit, nature thermal path environment alarm duration. alarm used with both single dual supplies. operated above below ground. collector emitter output transistor used normal switch configuration. example negative referenced load driven from -ALM shown Figure REV.
Figure AD594/AD595 Stand-Alone Celsius Thermometer
Simply omit thermocouple connect inputs (Pins common. output will reflect compensation voltage hence will indicate AD594/AD595 temperature with scale factor mV/°C. this three terminal, voltage output, temperature sensing mode, AD594/AD595 will operate over full military -55°C +125°C temperature range.
AD594/AD595
THERMOCOUPLE BASICS
Thermocouples economical rugged; they have reasonably good long-term stability. Because their small size, they respond quickly good choices where fast response important. They function over temperature ranges from cryogenics jet-engine exhaust have reasonable linearity accuracy. Because number free electrons piece metal depends both temperature composition metal, pieces dissimilar metal isothermal contact will exhibit potential difference that repeatable function temperature, shown Figure resulting voltage depends temperatures, repeatable way.
arrange output voltage that corresponds thermocouple referred 0°C. This voltage simply added thermocouple voltage then corresponds standard voltage tabulated ice-point referenced thermocouple.
PROPERLY SCALED f(T3)
CONSTANTAN
CuNi-
IRON
CONSTANTAN
CONSTANTAN
Figure Substitution Measured Reference Temperature Point Reference
IRON UNKNOWN TEMPERATURE POINT REFERENCE
Figure Thermocouple Voltage with Reference
temperature sensitivity silicon integrated circuit transistors quite predictable repeatable. This sensitivity exploited AD594/AD595 produce temperature related voltage compensate reference "cold" junction thermocouple shown Figure
Since thermocouple basically differential rather than absolute measuring device, know reference temperature required junctions temperature other inferred from output voltage. Thermocouples made specially selected materials have been exhaustively characterized terms voltage versus temperature compared primary temperature standards. Most notably water-ice point used tables standard thermocouple performance. alternative measurement technique, illustrated Figure used most practical applications where accuracy requirements warrant maintenance primary standards. reference junction temperature allowed change with environment measurement system, carefully measured some type absolute thermometer. measurement thermocouple voltage combined with knowledge reference temperature used calculate measurement junction temperature. Usual practice, however, convenient thermoelectric method measure reference temperature
CONSTANTAN
IRON
Figure Connecting Isothermal Junctions
Since compensation reference junction temperature, often convenient form reference "junction" connecting directly circuit wiring. long these connections compensation same temperature error will result.
OUTLINE DIMENSIONS
Dimensions shown inches (mm). PRINTED U.S.A.
TO-116 Package
Cerdip Package
REV.
C731e-5-6/89

Monolithic Thermocouple Amplifiers with Cold Junction Compensation AD5

Top Searches for this datasheet

Other recent searches